in[0] is not the first vector, it is all of the available input for port
0. So, you feed in 4 vectors in your test program, and the shape of
in[0] is (4,1024). You're missing a loop that iterates over the input
vectors.
On 03/11/2018 02:06 PM, Glen I Langston wrote:
Hello Gnuradio experts,
I'm following the gnuradio tutorial for creating an out of tree python
block.
My intention is fairly simple. To have a input stream of 4 vectors
and average these 4 vectors, outputting a single average vector
after the 4th vector arrives. Right now my vectors are 1024 channel
total power spectra.
My code is attached, along with the quality control code.
I've been at this for a while, but I must have the wrong model
in my head on how gnuradio holds these samples.
I'm not getting the proper size matches. I can not find any
decimation help, despite hours of googling...
Suggestions?
THanks
Glen
My intention is to make this 4 vector average with decimate a
part of the .grc environment, but the problems are easier to diagnose,
as the QA code is stands alone. Here are the messages I’m getting:
ESMU:vdecimate glangsto$ python qa_vdecimate.py
handler caught exception: could not broadcast input array from shape
(4,1024) into shape (1,1024)
Traceback (most recent call last):
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/gr/gateway.py",
line 55, in eval
try: self._callback()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/gnuradio/gr/gateway.py",
line 160, in __gr_block_handle
) for i in self.__out_indexes],
File "/Users/glangsto/Desktop/Research/vdecimate/vdecimate.py", line
58, in work
out[:] = self.sum/float(self.count)
ValueError: could not broadcast input array from shape (4,1024) into
shape (1,1024)
thread[thread-per-block[1]: <block vdecimate (2)>]: SWIG director method
error. Error detected when calling 'feval_ll.eval'
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